After shopping the web for weeks, I made contact with Hendrix GasTrux in Wauconda, IL. A tech by the name of Todd was more than helpful and confessed to driving a converted Mopar. Take a look at http://www.hendrixsystems.com and give them a call.

My Impco 425 was too cheap to mention, and I had it in 3 days. They carry everything for the X-450 also.